题目内容
(1)6×(
+
)+
(2)8
-(
+
)×
(3)5.6×
+
×5.6
(4)1
+0.125+3
+
.
| 1 |
| 24 |
| 5 |
| 36 |
| 3 |
| 4 |
(2)8
| 1 |
| 18 |
| 11 |
| 12 |
| 11 |
| 12 |
| 1 |
| 99 |
(3)5.6×
| 1 |
| 7 |
| 4 |
| 7 |
(4)1
| 7 |
| 16 |
| 9 |
| 16 |
| 7 |
| 8 |
分析:(1)可根据乘法分配律及加法交换律计算.
(2)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(3)可根据乘法分配律计算.
(4)可根据加法交换律及结合律计算.
(2)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(3)可根据乘法分配律计算.
(4)可根据加法交换律及结合律计算.
解答:解:(1)6×(
+
)+
=6×
+6×
+
,
=
+
+
,
=
+
+
,
=1
;
(2)8
-(
+
)×
=8
-
×
,
=8
+
,
=8
;
(3)5.6×
+
×5.6
=5.6×(
+
),
=5.6×
,
=4;
(4)1
+0.125+3
+
=1
+
+3
+
,
=(1
+3
)+(
+
),
=5+1,
=6.
| 1 |
| 24 |
| 5 |
| 36 |
| 3 |
| 4 |
=6×
| 1 |
| 24 |
| 5 |
| 36 |
| 3 |
| 4 |
=
| 1 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 1 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
=1
| 5 |
| 6 |
(2)8
| 1 |
| 18 |
| 11 |
| 12 |
| 11 |
| 12 |
| 1 |
| 99 |
=8
| 1 |
| 18 |
| 11 |
| 6 |
| 1 |
| 99 |
=8
| 1 |
| 18 |
| 1 |
| 54 |
=8
| 2 |
| 27 |
(3)5.6×
| 1 |
| 7 |
| 4 |
| 7 |
=5.6×(
| 1 |
| 7 |
| 4 |
| 7 |
=5.6×
| 5 |
| 7 |
=4;
(4)1
| 7 |
| 16 |
| 9 |
| 16 |
| 7 |
| 8 |
=1
| 7 |
| 16 |
| 1 |
| 8 |
| 9 |
| 16 |
| 7 |
| 8 |
=(1
| 7 |
| 16 |
| 9 |
| 16 |
| 1 |
| 8 |
| 7 |
| 8 |
=5+1,
=6.
点评:完成此类题目要注意分析题目中数据的特点,运用合适的方法计算.
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